Method and device for saving water and energy of converter waste heat boiler

Abstract

The invention relates to the field of water level controlling of a drum of a converter waste heat boiler, in particular to a method and a device for saving water and energy of the converter waste heat boiler. The method is characterized in that the processes of water level controlling of the drum of the waste heat boiler and pollution discharging are separated, so that the discharging operation caused by the fact that the water level in the drum is too high is reduced. The method particularly includes the following processes: when the water level in the drum of the waste heat boiler exceeds an upper limit, a water discharging pneumatic valve is turned on, sewage in the drum enters a pollution-discharging flash vessel, and the redundant hot water in the drum is guided into a deaerator after timing for a period of time until the water level of the deaerator is lower than the lower limit or oxygen blast of a converter occurs. When oxygen blast of the converter stops, and the water level in the deaerator is higher than the upper limit or the redundant hot water in the drum is disqualified, the redundant hot water in the drum is still guided into the pollution-discharging flash vessel. Compared with the prior art, the method and the device for saving water and energy of the converter waste heat boiler have the advantages of separating water level controlling from the pollution discharging process, reducing pollution discharging rate, according with the national energy-saving and emission-reducing strategy target and having good application prospect.

Description

technical field [0001] The invention relates to the field of drum water level control of a converter waste heat boiler, in particular to a water-saving and energy-saving method and device for a converter waste heat boiler. Background technique [0002] Reasonable and effective control of drum water level of converter waste heat boiler has always been a difficult problem to solve. According to the relevant national and industry regulations, the normal "pollution discharge rate" of waste heat boilers should be ≤5%. The waste heat boiler of the intermediate converter in the steelmaking enterprise adopts double water level control, which solves the problem of water level control, but at the same time causes a relatively high sewage discharge rate, and the actual average "pollution discharge rate" is ≥ 21%. In order to ensure the smooth progress of steelmaking production, it is necessary to maintain the normal water level of the high-level steam drum of the converter waste heat ...

AI Technical Summary

Problems solved by technology

[0003] Excessive "blower discharge rate" not only wastes a lot of very valuable demineralized water resources, but also takes away a lot of heat from a large amount of high-temperature "blower" water discharge, which greatly reduces the amount of steam produced by the converter waste heat boiler, and also produces new pollution problems

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